Processing of polypropylene–clay nanocomposites: Single-screw extrusion with in-line supercritical carbon dioxide feed versus twin-screw extrusion

The effect of PDMS on foamability of R-PP was investigated using a single screw extrusion foaming system, with supercritical carbon dioxide as the blowing agent. Experimental results indicate that the addition of a small amount of PDMS will improve expansion ratio of R-PP foamed samples. Furthermore, compared with pure R-PP, cell-population density of foamed samples obtained from R-PP/PP-g-MAH/PDMS blends was obviously higher than that of pure R-PP foams.The experimental results show that blending with PDMS is beneficial for improving foaming performance of R-PP.

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Microcellular Foaming of Polypropylene/Clay Nanocomposites with Supercritical Carbon Dioxide

Journal of Cellular Plastics ◽

10.1177/0021955x09339470 ◽

2009 ◽

Vol 45 (6) ◽

pp. 515-538 ◽

Cited By ~ 33

Author(s):

Xiu-Lei Jiang ◽

Jin-Biao Bao ◽

Tao Liu ◽

Ling Zhao ◽

Zhi-Mei Xu ◽

...

Keyword(s):

Carbon Dioxide ◽

Supercritical Carbon Dioxide ◽

Clay Nanocomposites ◽

Microcellular Foaming ◽

Supercritical Carbon

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Synthesis of polylactide/clay nanocomposites by in situ intercalative polymerization in supercritical carbon dioxide

European Polymer Journal ◽

10.1016/j.eurpolymj.2008.11.033 ◽

2009 ◽

Vol 45 (3) ◽

pp. 643-648 ◽

Cited By ~ 46

Author(s):

Laetitia Urbanczyk ◽

Fred Ngoundjo ◽

Michael Alexandre ◽

Christine Jérôme ◽

Christophe Detrembleur ◽

...

Keyword(s):

Carbon Dioxide ◽

Supercritical Carbon Dioxide ◽

Clay Nanocomposites ◽

Intercalative Polymerization ◽

Supercritical Carbon

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Effect of supercritical carbon dioxide as an exfoliation aid on bio-based polyethylene terephthalate glycol-modified/clay nanocomposites

Korea-Australia Rheology Journal ◽

10.1007/s13367-013-0015-8 ◽

2013 ◽

Vol 25 (3) ◽

pp. 145-152 ◽

Cited By ~ 12

Author(s):

Kwangho Jang ◽

Jae Wook Lee ◽

In-Kwon Hong ◽

Sangmook Lee

Keyword(s):

Carbon Dioxide ◽

Supercritical Carbon Dioxide ◽

Polyethylene Terephthalate ◽

Clay Nanocomposites ◽

Modified Clay ◽

Supercritical Carbon

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Twin-Screw Extrusion Modelling

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.45.436 ◽

2006 ◽

Vol 45 ◽

pp. 436-441 ◽

Cited By ~ 3

Author(s):

P.A. McGuire ◽

S. Blackburn ◽

E.M. Holt

Keyword(s):

Temperature Correction ◽

Force Balance ◽

Rheological Parameters ◽

Twin Screw Extruder ◽

Twin Screw Extrusion ◽

Screw Extruder ◽

Single Screw Extrusion ◽

Heating Effects ◽

Screw Extrusion ◽

Twin Screw

A mathematical model has been derived to describe the pressure drop along the conveying and reverse sections of a partly full, fully intermeshing co-rotating twin-screw extruder. The model extends previous work on single screw extrusion, whereby the Benbow-Bridgwater model of paste rheology is combined with a force balance on a plug of paste. Experiments to verify the model have been carried out using a laboratory scale twin-screw extruder fitted with a hydraulic feeder and a modified barrel section allowing the collection of pressure data at numerous points along the extruder. Initial results suggested that the model was able to correctly predict the trends observed but underestimated the absolute values of the pressure. This was attributed to a change in the rheology of the paste due to viscous heating effects. Further experimental work was carried out to determine the relationship between the rheological parameters and temperature; this allowed a temperature correction to be made to the initial data after which the agreement with the predictions was greatly improved.

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